Python/Pandas - 将类型从 Pandas 句点转换为字符串 [英] Python/Pandas - Convert type from pandas period to string

问题描述

我有一个数据框:

         Seasonal
Date             
2014-12 -1.089744
2015-01 -0.283654
2015-02  0.158974
2015-03  0.461538

我在 DataFrame 中使用了 pd.to_period，所以它的索引变成了 Pandas 周期类型(type 'pandas._period.Period').

I used a pd.to_period in the DataFrame, so its index has turned into a Pandas period type (type 'pandas._period.Period').

现在，我想将该索引转换为字符串.我正在尝试应用以下内容:

Now, I want to turn that index to strings. I'm trying to apply the following:

df.index=df.index.astype(str)

然而这不起作用...

ValueError: Cannot cast PeriodIndex to dtype |S0

我的代码从那时起就被冻结了.

My code has been frozen since then.

求救

推荐答案

您可以使用 to_series 然后转换为string:

print df

#        Seasonal
#Date             
#2014-12 -1.089744
#2015-01 -0.283654
#2015-02  0.158974
#2015-03  0.461538

print df.index

#PeriodIndex(['2014-12', '2015-01', '2015-02', '2015-03'],
#              dtype='int64', name=u'Date', freq='M')

df.index=df.index.to_series().astype(str)
print df

#         Seasonal
#Date             
#2014-12 -1.089744
#2015-01 -0.283654
#2015-02  0.158974
#2015-03  0.461538

print df.index

#Index([u'2014-12', u'2015-01', u'2015-02', u'2015-03'], dtype='object', name=u'Date')

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